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    <title>Document</title>
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<script>
    function fullpermutate(str) {
        // var str = 'abc'
        var result = [];
        if (str.length > 1) {
            //遍历每一项
            for (var m = 0; m < str.length; m++) {
                //拿到当前的元素
                var left = str[m];
                //除当前元素的其他元素组合
                var rest = str.slice(0, m) + str.slice(m + 1, str.length);
                //上一次递归返回的全排列
                var preResult = fullpermutate(rest);
                //组合在一起
                for (var i = 0; i < preResult.length; i++) {
                    var tmp = left + preResult[i]
                    result.push(tmp);
                }
            }
        } else if (str.length == 1) {
            result.push(str);
        }
        return(result);
    }
    var t = fullpermutate('abc') 
    console.log(t);
</script>